The most important factors affecting on window treatments are designed are: type of treatment, type of material, aim of window treatment using and usually wishes of the customer. Designers must study all of these factors before beginning the creation of the treatment. They must use safety and clean materials, which will be used in the window covering. Also designers must to know the specification of modern window types, because of the size and of window treatment depends on window specifications. Color choosing depends of the aim of window treatment using, for example dark colors are suitable for bedrooms and child rooms, while light colors can be used for kitchen and living rooms. Designers use modern and powerful computer programs, which help them to provide all factors depending on how window treatment designs are created.